I use an Arca-Swiss type Markins L-bracket (here
https://www.photoproshop.com/product_info.php/cPath/36_60/products_id/1005 ) and for anyone serious about tripod use, I seriously recommend one. It has a strap lug on the end, as do many ordinary Arca-Swiss plates (eg Hejnar on ebay).
I have fashioned a simple loop from the original Canon strap, about an inch long, sewn to this lug. It's very secure - I made damn sure it was - and have been using it for over a year (smooth any sharp edges first

).
Black Rapid clip simply hooks into this loop. Doesn't affect tripod use at all, with or without the BR strap attached, and the loop folds flush to the base of the camera when not in use, with a small patch of velcro to stop it flopping down. You don't know it's there. I also prefer the balance point which IMHO makes the camera hang better.
I've tried just about ever other attachment method I can think of, and this one is so simple and 100% effective

Just make sure you sew it securely with multiple and indpendent stitchings but i'm pretty sure the BR strap will give way before my little loop does
I would show a picture but my camera can't photograph itself - hope you get the idea.
BTW OpTech strap is poor, not the same way of carrying a camera at all. It just gets in the way.